Black list of region locked games on Steam (with publishers)
- Borderlands 2 (2K, a.k.a. Take Two, no region locks on retail version)
- Confrontation (Focus Home Interactive)
- Dark Souls: Prepare to Die Edition (Namco Bandai, no region locks on retail version)
- F1 2012 (Codemasters)
- Max Payne 3 (Rockstar, a.k.a 2K, a.k.a. Take Two)
- Ridge Racer Unbounded (Namco Bandai)
- Spec Ops: The Line (2K, a.k.a. Take Two)
- The Witcher 2 (CD Project, 1C -- investigating, no region locks on retail version)
Clarification on 'no region locks on retail (boxed) version': The version bought directly from Steam is region locked, the boxed version also uses Steam, but isn't region locked.
This list is based on Steam CDR data, and therefore is fully complete.
Black list of region locked retail games (with publishers)
- Darksiders 2 (THQ)
- Prototype 2 (Activision)
- Risen 2 (Deep Silver)
- Trine 2 (Atlus)
- Most, if not all, Valve games
- Most, if not all, Bethesda games